Understanding the transport of nanolime consolidants within Maastricht limestone

摘要: tNovel nanomaterials, such as nanosilica or nano-titanium oxide, have been developed in the last decadefor conservation of built heritage. Among nanolimes acquired a considerablerelevance due to their potentialities consolidant product. The so-called nanolimes, colloidal disper-sions calcium hydroxide nanoparticles alcohols, successfully applied pre-consolidantson frescos and paper, use has later extended plasters, renders stone. Nanolimeshave better compared conventional inorganic consolidants based on limewater (e.g.faster carbonation rate higher concentration). Moreover, are consid-ered more compatible with CaCO3-based substrates than alkoxysilanes (e.g. TEOS), most widely usedconsolidant products. Nanolimes can guarantee recovery superficial cohesion degradedmaterials. However, when mass consolidation is required, like case decayed stone, nanolimesshow some limitations. One problems caused by nanolime accumulation at just beneath thesurface treated material. In order solve this problem, transport mechanism nanolimewithin porous materials, stone renders, should first be understood. Commercial nanolimeswere Maastricht limestone, high-porosity yellowish used Netherlands andBelgium traditional building absorption drying behaviour lime-stone was measured deposition studied optical scanning electronmicroscopy. results show that strictly related properties solvent.The alcoholic solvent guarantees stable dispersion penetrates depth material, but par-tially back-transported surface. high volatility stability dispersionfavour partial back-migration lime surface during